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Hollow core photonic bandgap optical fibres and methods of fabrication

机译：中空光子带隙光纤及其制造方法

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摘要

A hollow core photonic bandgap optical fibre comprises a cladding having capillaries formed of struts joined at nodes arranged in a hexagonal array. The fibre has a hollow core formed by excluding nineteen capillaries from the centre of the array, which is bounded by a first ring of capillaries comprising corner capillaries next to corners of the core and side capillaries between the corner capillaries. The array has a core size ratio of 1.26 or above, defined as a ratio of the core diameter to the cladding diameter normalised to those of an undistorted hexagonal array; a first ring ratio between 0.55 and 2.50, defined as a ratio of the length of radial capillary struts of the first ring to the length of a strut in an undistorted array; and a core node spacing between 0.60 and 1.90, defined as a ratio of the core-side strut of the largest corner capillary to that of the smallest side capillary. A method of manufacturing a holey fiber by applying four different and progressively increasing pressures to each of the core, outer capillaries, corner capillaries and side capillaries is also claimed.
机译：中空光子带隙光纤包括具有由毛细管形成的毛细管的包层，所述毛细管在以六边形阵列布置的节点处连接。该纤维具有通过从阵列的中心排除十九个毛细管而形成的中空纤芯，该空心纤芯由第一毛细管环界定，该第一毛细管环包括在纤芯的拐角附近的角毛细管和在角毛细管之间的侧毛细管。该阵列的芯尺寸比为1.26或更大，定义为归一化为未变形六边形阵列的芯直径与包层直径之比;第一环比在0.55至2.50之间，其定义为第一环的径向毛细管支柱的长度与未变形阵列中的支柱的长度的比;核心节点间距在0.60至1.90之间，定义为最大角毛细管的芯侧支柱与最小侧毛细管的芯侧支柱之比。还要求一种通过向芯，外毛细管，角毛细管和侧毛细管中的每一个施加四个不同且逐渐增加的压力来制造多孔纤维的方法。

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